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M_i_g_u_e_l's avatar
M_i_g_u_e_l
Copper Contributor
Apr 23, 2026
Solved

AD Replication Error 1908 (Source DSA)

Hi all, I’m troubleshooting an Active Directory replication issue (error 1908 – “Could not find the domain controller”) in a multi-site environment with 16 domain controllers across multiple locatio...
Active Directory
windows server
  • M_i_g_u_e_l's avatar
    M_i_g_u_e_l
    May 22, 2026

    Thank you Mister_K​ and Josy_O​ for your responses. 

    The root cause of the issue was not A-DC (Main-DC); it was a read-only DC that had broken DFSR/SYSVOL replication. This DC was showing 100% replication failure (6/6), but I focused on the main DC and overlooked the problematic one.

    I demoted and shut it down since it was going to be replaced eventually. After that, the domain looks healthy and replication is working properly again.

Josy_O's avatar
Josy_O
Copper Contributor
Apr 27, 2026

Were any changes made to your environment since the last time replication worked, if so what change was made?  What is the DNS configuration of this DC, is it pointing to itself and another DC in the same AD Site? When you run repadmin /showrepl from this DC does it show successfull from all the INBOUND NEIGHBORS?  What are the error messages, if any?    When you run repadmin /replsummary from this DC what result do you see?   When you run repadmin /syncall /Aped  does push replication complete to any of the DCs?